Lewis and clark By 20JABOCK Apr 30, 1803 When the Louisiana was signed May 14, 1804 Lewis and Clarks expedition began Aug 30, 1804 Lewis and Clark meet the Yankton Sioux Nov 2, 1804 Lewis and clark build there first fort Nov 4, 1804 Lewis and Clark meet Sacugawea Aug 17, 1805 Lewis and Clark meet the rocky moutains Nov 7, 1805 Lewis and Clark meet the Pacific Ocean Jul 3, 1806 Lewis and Clark go seperate ways Jul 26, 1806 Lewis and Clark were atacted by Black Foot indains Sep 23, 1806 Lewis and Clark got back from there trip